<template>
  <view>
    <slot v-if="!nodes.length" />
    <!--#ifdef APP-PLUS-NVUE-->
    <web-view id="_top" ref="web" :style="'margin-top:-2px;height:' + height + 'px'" @onPostMessage="_message" />
    <!--#endif-->
    <!--#ifndef APP-PLUS-NVUE-->
    <view id="_top" :style="showAm + (selectable ? ';user-select:text;-webkit-user-select:text' : '')">
      <!--#ifdef H5 || MP-360-->
      <div :id="'rtf' + uid"></div>
      <!--#endif-->
      <!--#ifndef H5 || MP-360-->
      <trees :nodes="nodes" :lazyLoad="lazyLoad" :loading="loadingImg" />
      <!--#endif-->
    </view>
    <!--#endif-->
  </view>
</template>

<script>
  var search
  // #ifndef H5 || APP-PLUS-NVUE || MP-360
  import trees from './libs/trees'
  import Parser from './libs/MpHtmlParser.js'
  var cache = {}
  // #ifdef MP-WEIXIN || MP-TOUTIAO
  var fs = uni.getFileSystemManager ? uni.getFileSystemManager() : null
  // #endif
  var dom
  // 计算 cache 的 key
  function hash(str) {
    for (var i = str.length, val = 5381; i--;) val += (val << 5) + str.charCodeAt(i)
    return val
  }
  // #endif
  // #ifdef H5 || APP-PLUS-NVUE || MP-360
  import cfg from './libs/config.js'
  var {
    windowWidth,
    platform
  } = uni.getSystemInfoSync()
  // #endif
  // #ifdef APP-PLUS-NVUE
  var weexDom = weex.requireModule('dom')
  // #endif
  /**
   * Parser 富文本组件
   * @tutorial https://github.com/jin-yufeng/Parser
   * @property {String} html 富文本数据
   * @property {Boolean} autopause 是否在播放一个视频时自动暂停其他视频
   * @property {Boolean} autoscroll 是否自动给所有表格添加一个滚动层
   * @property {Boolean} autosetTitle 是否自动将 title 标签中的内容设置到页面标题
   * @property {Number} compress 压缩等级
   * @property {String} domain 图片、视频等链接的主域名
   * @property {Boolean} lazyLoad 是否开启图片懒加载
   * @property {String} loadingImg 图片加载完成前的占位图
   * @property {Boolean} selectable 是否开启长按复制
   * @property {Object} tagStyle 标签的默认样式
   * @property {Boolean} showWithAnimation 是否使用渐显动画
   * @property {Boolean} useAnchor 是否使用锚点
   * @property {Boolean} useCache 是否缓存解析结果
   * @event {Function} parse 解析完成事件
   * @event {Function} load dom 加载完成事件
   * @event {Function} ready 所有图片加载完毕事件
   * @event {Function} error 错误事件
   * @event {Function} imgtap 图片点击事件
   * @event {Function} linkpress 链接点击事件
   * @author JinYufeng
   * @version 20201029
   * @listens MIT
   */
  export default {
    name: 'jyf-parser',
    data() {
      return {
        // #ifdef H5 || MP-360
        uid: this._uid,
        // #endif
        // #ifdef APP-PLUS-NVUE
        height: 1,
        // #endif
        // #ifndef APP-PLUS-NVUE
        showAm: '',
        // #endif
        nodes: [],
      }
    },
    // #ifndef H5 || APP-PLUS-NVUE || MP-360
    components: {
      trees,
    },
    // #endif
    props: {
      html: String,
      autopause: {
        type: Boolean,
        default: true,
      },
      autoscroll: Boolean,
      autosetTitle: {
        type: Boolean,
        default: true,
      },
      // #ifndef H5 || APP-PLUS-NVUE || MP-360
      compress: Number,
      loadingImg: String,
      useCache: Boolean,
      // #endif
      domain: String,
      lazyLoad: Boolean,
      selectable: Boolean,
      tagStyle: Object,
      showWithAnimation: Boolean,
      useAnchor: Boolean,
    },
    watch: {
      html(html) {
        this.setContent(html)
      },
    },
    created() {
      // 图片数组
      this.imgList = []
      this.imgList.each = function(f) {
        for (var i = 0, len = this.length; i < len; i++) this.setItem(i, f(this[i], i, this))
      }
      this.imgList.setItem = function(i, src) {
        if (i == void 0 || !src) return
        // #ifndef MP-ALIPAY || APP-PLUS
        // 去重
        if (src.indexOf('http') == 0 && this.includes(src)) {
          var newSrc = src.split('://')[0]
          for (var j = newSrc.length, c;
            (c = src[j]); j++) {
            if (c == '/' && src[j - 1] != '/' && src[j + 1] != '/') break
            newSrc += Math.random() > 0.5 ? c.toUpperCase() : c
          }
          newSrc += src.substr(j)
          return (this[i] = newSrc)
        }
        // #endif
        this[i] = src
        // 暂存 data src
        if (src.includes('data:image')) {
          var filePath,
            info = src.match(/data:image\/(\S+?);(\S+?),(.+)/)
          if (!info) return
          // #ifdef MP-WEIXIN || MP-TOUTIAO
          filePath = `${wx.env.USER_DATA_PATH}/${Date.now()}.${info[1]}`
          fs &&
            fs.writeFile({
              filePath,
              data: info[3],
              encoding: info[2],
              success: () => (this[i] = filePath),
            })
          // #endif
          // #ifdef APP-PLUS
          filePath = `_doc/parser_tmp/${Date.now()}.${info[1]}`
          var bitmap = new plus.nativeObj.Bitmap()
          bitmap.loadBase64Data(src, () => {
            bitmap.save(filePath, {}, () => {
              bitmap.clear()
              this[i] = filePath
            })
          })
          // #endif
        }
      }
    },
    mounted() {
      // #ifdef H5 || MP-360
      this.document = document.getElementById('rtf' + this._uid)
      // #endif
      // #ifndef H5 || APP-PLUS-NVUE || MP-360
      if (dom) this.document = new dom(this)
      // #endif
      if (search) this.search = (args) => search(this, args)
      // #ifdef APP-PLUS-NVUE
      this.document = this.$refs.web
      setTimeout(() => {
        // #endif
        if (this.html) this.setContent(this.html)
        // #ifdef APP-PLUS-NVUE
      }, 30)
      // #endif
    },
    beforeDestroy() {
      // #ifdef H5 || MP-360
      if (this._observer) this._observer.disconnect()
      // #endif
      this.imgList.each((src) => {
        // #ifdef APP-PLUS
        if (src && src.includes('_doc')) {
          plus.io.resolveLocalFileSystemURL(src, (entry) => {
            entry.remove()
          })
        }
        // #endif
        // #ifdef MP-WEIXIN || MP-TOUTIAO
        if (src && src.includes(uni.env.USER_DATA_PATH))
          fs &&
          fs.unlink({
            filePath: src,
          })
        // #endif
      })
      clearInterval(this._timer)
    },
    methods: {
      // 设置富文本内容
      setContent(html, append) {
        // #ifdef APP-PLUS-NVUE
        if (!html) return (this.height = 1)
        if (append)
          this.$refs.web.evalJs(
            "var b=document.createElement('div');b.innerHTML='" + html.replace(/'/g, "\\'") +
            "';document.getElementById('parser').appendChild(b)"
          )
        else {
          html =
            '<meta charset="utf-8" /><meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no"><style>html,body{width:100%;height:100%;overflow:hidden}body{margin:0}</style><base href="' +
            this.domain +
            '"><div id="parser"' +
            (this.selectable ? '>' : ' style="user-select:none">') +
            this._handleHtml(html).replace(/\n/g, '\\n') +
            '</div><script>"use strict";function e(e){if(window.__dcloud_weex_postMessage||window.__dcloud_weex_){var t={data:[e]};window.__dcloud_weex_postMessage?window.__dcloud_weex_postMessage(t):window.__dcloud_weex_.postMessage(JSON.stringify(t))}}document.body.onclick=function(){e({action:"click"})},' +
            (this.showWithAnimation ? 'document.body.style.animation="_show .5s",' : '') +
            'setTimeout(function(){e({action:"load",text:document.body.innerText,height:document.getElementById("parser").scrollHeight})},50);\x3c/script>'
          if (platform == 'android') html = html.replace(/%/g, '%25')
          this.$refs.web.evalJs("document.write('" + html.replace(/'/g, "\\'") + "');document.close()")
        }
        this.$refs.web.evalJs(
          'var t=document.getElementsByTagName("title");t.length&&e({action:"getTitle",title:t[0].innerText});for(var o,n=document.getElementsByTagName("style"),r=1;o=n[r++];)o.innerHTML=o.innerHTML.replace(/body/g,"#parser");for(var a,c=document.getElementsByTagName("img"),s=[],i=0==c.length,d=0,l=0,g=0;a=c[l];l++)parseInt(a.style.width||a.getAttribute("width"))>' +
          windowWidth +
          '&&(a.style.height="auto"),a.onload=function(){++d==c.length&&(i=!0)},a.onerror=function(){++d==c.length&&(i=!0),' +
          (cfg.errorImg ? 'this.src="' + cfg.errorImg + '",' : '') +
          'e({action:"error",source:"img",target:this})},a.hasAttribute("ignore")||"A"==a.parentElement.nodeName||(a.i=g++,s.push(a.getAttribute("original-src")||a.src||a.getAttribute("data-src")),a.onclick=function(t){t.stopPropagation(),e({action:"preview",img:{i:this.i,src:this.src}})});e({action:"getImgList",imgList:s});for(var u,m=document.getElementsByTagName("a"),f=0;u=m[f];f++)u.onclick=function(m){m.stopPropagation();var t,o=this.getAttribute("href");if("#"==o[0]){var n=document.getElementById(o.substr(1));n&&(t=n.offsetTop)}return e({action:"linkpress",href:o,offset:t}),!1};for(var h,y=document.getElementsByTagName("video"),v=0;h=y[v];v++)h.style.maxWidth="100%",h.onerror=function(){e({action:"error",source:"video",target:this})}' +
          (this.autopause ? ',h.onplay=function(){for(var e,t=0;e=y[t];t++)e!=this&&e.pause()}' : '') +
          ';for(var _,p=document.getElementsByTagName("audio"),w=0;_=p[w];w++)_.onerror=function(){e({action:"error",source:"audio",target:this})};' +
          (this.autoscroll ?
            'for(var T,E=document.getElementsByTagName("table"),B=0;T=E[B];B++){var N=document.createElement("div");N.style.overflow="scroll",T.parentNode.replaceChild(N,T),N.appendChild(T)}' :
            '') +
          'var x=document.getElementById("parser");clearInterval(window.timer),window.timer=setInterval(function(){i&&clearInterval(window.timer),e({action:"ready",ready:i,height:x.scrollHeight})},350)'
        )
        this.nodes = [1]
        // #endif
        // #ifdef H5 || MP-360
        if (!html) {
          if (this.rtf && !append) this.rtf.parentNode.removeChild(this.rtf)
          return
        }
        var div = document.createElement('div')
        if (!append) {
          if (this.rtf) this.rtf.parentNode.removeChild(this.rtf)
          this.rtf = div
        } else {
          if (!this.rtf) this.rtf = div
          else this.rtf.appendChild(div)
        }
        div.innerHTML = this._handleHtml(html, append)
        for (var styles = this.rtf.getElementsByTagName('style'), i = 0, style;
          (style = styles[i++]);) {
          style.innerHTML = style.innerHTML.replace(/body/g, '#rtf' + this._uid)
          style.setAttribute('scoped', 'true')
        }
        // 懒加载
        if (!this._observer && this.lazyLoad && IntersectionObserver) {
          this._observer = new IntersectionObserver(
            (changes) => {
              for (let item, i = 0;
                (item = changes[i++]);) {
                if (item.isIntersecting) {
                  item.target.src = item.target.getAttribute('data-src')
                  item.target.removeAttribute('data-src')
                  this._observer.unobserve(item.target)
                }
              }
            }, {
              rootMargin: '500px 0px 500px 0px',
            }
          )
        }
        var _ts = this
        // 获取标题
        var title = this.rtf.getElementsByTagName('title')
        if (title.length && this.autosetTitle)
          uni.setNavigationBarTitle({
            title: title[0].innerText,
          })
        // 填充 domain
        var fill = (target) => {
          var src = target.getAttribute('src')
          if (this.domain && src) {
            if (src[0] == '/') {
              if (src[1] == '/') target.src = (this.domain.includes('://') ? this.domain.split('://')[0] : '') + ':' +
                src
              else target.src = this.domain + src
            } else if (!src.includes('://') && src.indexOf('data:') != 0) target.src = this.domain + '/' + src
          }
        }
        // 图片处理
        this.imgList.length = 0
        var imgs = this.rtf.getElementsByTagName('img')
        for (let i = 0, j = 0, img;
          (img = imgs[i]); i++) {
          if (parseInt(img.style.width || img.getAttribute('width')) > windowWidth) img.style.height = 'auto'
          fill(img)
          if (!img.hasAttribute('ignore') && img.parentElement.nodeName != 'A') {
            img.i = j++
            _ts.imgList.push(img.getAttribute('original-src') || img.src || img.getAttribute('data-src'))
            img.onclick = function(e) {

              e.stopPropagation()
              var preview = true
              this.ignore = () => (preview = false)
              _ts.$emit('imgtap', this)
              if (preview) {
                uni.previewImage({
                  current: this.i,
                  urls: _ts.imgList,
                })
              }
            }
          }
          img.onerror = function() {
            if (cfg.errorImg) _ts.imgList[this.i] = this.src = cfg.errorImg
            _ts.$emit('error', {
              source: 'img',
              target: this,
            })
          }
          if (_ts.lazyLoad && this._observer && img.src && img.i != 0) {
            img.setAttribute('data-src', img.src)
            img.removeAttribute('src')
            this._observer.observe(img)
          }
        }
        // 链接处理
        var links = this.rtf.getElementsByTagName('a')
        for (var link of links) {
          link.onclick = function(e) {
            e.stopPropagation()
            var jump = true,
              href = this.getAttribute('href')
            _ts.$emit('linkpress', {
              href,
              ignore: () => (jump = false),
            })
            if (jump && href) {
              if (href[0] == '#') {
                if (_ts.useAnchor) {
                  _ts.navigateTo({
                    id: href.substr(1),
                  })
                }
              } else if (href.indexOf('http') == 0 || href.indexOf('//') == 0) return true
              else
                uni.navigateTo({
                  url: href,
                })
            }
            return false
          }
        }
        // 视频处理
        var videos = this.rtf.getElementsByTagName('video')
        _ts.videoContexts = videos
        for (let video, i = 0;
          (video = videos[i++]);) {
          fill(video)
          video.style.maxWidth = '100%'
          video.onerror = function() {
            _ts.$emit('error', {
              source: 'video',
              target: this,
            })
          }
          video.onplay = function() {
            if (_ts.autopause)
              for (let item, i = 0;
                (item = _ts.videoContexts[i++]);)
                if (item != this) item.pause()
          }
        }
        // 音频处理
        var audios = this.rtf.getElementsByTagName('audio')
        for (var audio of audios) {
          fill(audio)
          audio.onerror = function() {
            _ts.$emit('error', {
              source: 'audio',
              target: this,
            })
          }
        }
        // 表格处理
        if (this.autoscroll) {
          var tables = this.rtf.getElementsByTagName('table')
          for (var table of tables) {
            let div = document.createElement('div')
            div.style.overflow = 'scroll'
            table.parentNode.replaceChild(div, table)
            div.appendChild(table)
          }
        }
        if (!append) this.document.appendChild(this.rtf)
        this.$nextTick(() => {
          this.nodes = [1]
          this.$emit('load')
        })
        setTimeout(() => (this.showAm = ''), 500)
        // #endif
        // #ifndef APP-PLUS-NVUE
        // #ifndef H5 || MP-360
        var nodes
        if (!html) return (this.nodes = [])
        var parser = new Parser(html, this)
        // 缓存读取
        if (this.useCache) {
          var hashVal = hash(html)
          if (cache[hashVal]) nodes = cache[hashVal]
          else {
            nodes = parser.parse()
            cache[hashVal] = nodes
          }
        } else nodes = parser.parse()
        this.$emit('parse', nodes)
        if (append) this.nodes = this.nodes.concat(nodes)
        else this.nodes = nodes
        if (nodes.length && nodes.title && this.autosetTitle)
          uni.setNavigationBarTitle({
            title: nodes.title,
          })
        if (this.imgList) this.imgList.length = 0
        this.videoContexts = []
        this.$nextTick(() => {
          ;
          (function f(cs) {
            for (var i = cs.length; i--;) {
              if (cs[i].top) {
                cs[i].controls = []
                cs[i].init()
                f(cs[i].$children)
              }
            }
          })(this.$children)
          this.$emit('load')
        })
        // #endif
        var height
        clearInterval(this._timer)
        this._timer = setInterval(() => {
          // #ifdef H5 || MP-360
          this.rect = this.rtf.getBoundingClientRect()
          // #endif
          // #ifndef H5 || MP-360
          uni
            .createSelectorQuery()
            .in(this)
            .select('#_top')
            .boundingClientRect()
            .exec((res) => {
              if (!res) return
              this.rect = res[0]
              // #endif
              if (this.rect.height == height) {
                this.$emit('ready', this.rect)
                clearInterval(this._timer)
              }
              height = this.rect.height
              // #ifndef H5 || MP-360
            })
          // #endif
        }, 350)
        if (this.showWithAnimation && !append) this.showAm = 'animation:_show .5s'
        // #endif
      },
      // 获取文本内容
      getText(ns = this.nodes) {
        var txt = ''
        // #ifdef APP-PLUS-NVUE
        txt = this._text
        // #endif
        // #ifdef H5 || MP-360
        txt = this.rtf.innerText
        // #endif
        // #ifndef H5 || APP-PLUS-NVUE || MP-360
        for (var i = 0, n;
          (n = ns[i++]);) {
          if (n.type == 'text')
            txt += n.text
            .replace(/&nbsp;/g, '\u00A0')
            .replace(/&lt;/g, '<')
            .replace(/&gt;/g, '>')
            .replace(/&amp;/g, '&')
          else if (n.type == 'br') txt += '\n'
          else {
            // 块级标签前后加换行
            var block = n.name == 'p' || n.name == 'div' || n.name == 'tr' || n.name == 'li' || (n.name[0] == 'h' && n
              .name[1] > '0' && n.name[1] < '7')
            if (block && txt && txt[txt.length - 1] != '\n') txt += '\n'
            if (n.children) txt += this.getText(n.children)
            if (block && txt[txt.length - 1] != '\n') txt += '\n'
            else if (n.name == 'td' || n.name == 'th') txt += '\t'
          }
        }
        // #endif
        return txt
      },
      // 锚点跳转
      in(obj) {
        if (obj.page && obj.selector && obj.scrollTop) this._in = obj
      },
      navigateTo(obj) {
        if (!this.useAnchor) return obj.fail && obj.fail('Anchor is disabled')
        // #ifdef APP-PLUS-NVUE
        if (!obj.id) weexDom.scrollToElement(this.$refs.web)
        else
          this.$refs.web.evalJs(
            'var pos=document.getElementById("' +
            obj.id +
            '");if(pos)post({action:"linkpress",href:"#",offset:pos.offsetTop+' +
            (obj.offset || 0) +
            '})'
          )
        obj.success && obj.success()
        // #endif
        // #ifndef APP-PLUS-NVUE
        var d = ' '
        // #ifdef MP-WEIXIN || MP-QQ || MP-TOUTIAO
        d = '>>>'
        // #endif
        var selector = uni
          .createSelectorQuery()
          .in(this._in ? this._in.page : this)
          .select((this._in ? this._in.selector : '#_top') + (obj.id ?
            `${d}#${obj.id},${this._in ? this._in.selector : '#_top'}${d}.${obj.id}` : ''))
          .boundingClientRect()
        if (this._in) selector.select(this._in.selector).scrollOffset().select(this._in.selector).boundingClientRect()
        else selector.selectViewport().scrollOffset()
        selector.exec((res) => {
          if (!res[0]) return obj.fail && obj.fail('Label not found')
          var scrollTop = res[1].scrollTop + res[0].top - (res[2] ? res[2].top : 0) + (obj.offset || 0)
          if (this._in) this._in.page[this._in.scrollTop] = scrollTop
          else
            uni.pageScrollTo({
              scrollTop,
              duration: 300,
            })
          obj.success && obj.success()
        })
        // #endif
      },
      // 获取视频对象
      getVideoContext(id) {
        // #ifndef APP-PLUS-NVUE
        if (!id) return this.videoContexts
        else
          for (var i = this.videoContexts.length; i--;)
            if (this.videoContexts[i].id == id) return this.videoContexts[i]
        // #endif
      },
      // #ifdef H5 || APP-PLUS-NVUE || MP-360
      _handleHtml(html, append) {
        if (!append) {
          // 处理 tag-style 和 userAgentStyles
          var style = '<style>@keyframes _show{0%{opacity:0}100%{opacity:1}}img{max-width:100%}'
          for (var item in cfg.userAgentStyles) style += `${item}{${cfg.userAgentStyles[item]}}`
          for (item in this.tagStyle) style += `${item}{${this.tagStyle[item]}}`
          style += '</style>'
          html = style + html
        }
        // 处理 rpx
        if (html.includes('rpx')) html = html.replace(/[0-9.]+\s*rpx/g, ($) => (parseFloat($) * windowWidth) / 750 +
          'px')
        return html
      },
      // #endif
      // #ifdef APP-PLUS-NVUE
      _message(e) {
        // 接收 web-view 消息
        var d = e.detail.data[0]
        switch (d.action) {
          case 'load':
            this.$emit('load')
            this.height = d.height
            this._text = d.text
            break
          case 'getTitle':
            if (this.autosetTitle)
              uni.setNavigationBarTitle({
                title: d.title,
              })
            break
          case 'getImgList':
            this.imgList.length = 0
            for (var i = d.imgList.length; i--;) this.imgList.setItem(i, d.imgList[i])
            break
          case 'preview':
            var preview = true
            d.img.ignore = () => (preview = false)
            this.$emit('imgtap', d.img)
            if (preview)
              uni.previewImage({
                current: d.img.i,
                urls: this.imgList,
              })
            break
          case 'linkpress':
            var jump = true,
              href = d.href
            this.$emit('linkpress', {
              href,
              ignore: () => (jump = false),
            })
            if (jump && href) {
              if (href[0] == '#') {
                if (this.useAnchor)
                  weexDom.scrollToElement(this.$refs.web, {
                    offset: d.offset,
                  })
              } else if (href.includes('://')) plus.runtime.openWeb(href)
              else
                uni.navigateTo({
                  url: href,
                })
            }
            break
          case 'error':
            if (d.source == 'img' && cfg.errorImg) this.imgList.setItem(d.target.i, cfg.errorImg)
            this.$emit('error', {
              source: d.source,
              target: d.target,
            })
            break
          case 'ready':
            this.height = d.height
            if (d.ready)
              uni
              .createSelectorQuery()
              .in(this)
              .select('#_top')
              .boundingClientRect()
              .exec((res) => {
                this.rect = res[0]
                this.$emit('ready', res[0])
              })
            break
          case 'click':
            this.$emit('click')
            this.$emit('tap')
        }
      },
      // #endif
    },
  }
</script>

<style>
  @keyframes _show {
    0% {
      opacity: 0;
    }

    100% {
      opacity: 1;
    }
  }

  /* #ifdef MP-WEIXIN */
  :host {
    display: block;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* #endif */
</style>
